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To find the moles of alcohol in 70 cl of Jack Daniel's at 40% ABV (alcohol by volume), first convert the volume to liters: 70 cl = 0.7 L. Since 40% ABV means that 40% of the liquid is pure ethanol, the volume of ethanol is 0.7 L × 0.40 = 0.28 L. The density of ethanol is approximately 0.789 g/mL, so the mass of ethanol is 0.28 L × 789 g/L = 220.92 g. Finally, to find the moles, divide the mass by the molar mass of ethanol (approximately 46.07 g/mol): 220.92 g ÷ 46.07 g/mol ≈ 4.79 moles of ethanol.

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Alcohol is typically measured in terms of alcohol by volume (ABV), which represents the percentage of alcohol in a beverage relative to the total volume. For example, a beverage with 12% ABV contains 12% pure alcohol and 88% other components. Another common measurement is proof, which is twice the ABV percentage; thus, a drink with 40% ABV is 80 proof. These measurements help consumers understand the strength of alcoholic beverages and make informed choices about consumption.


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